In some cases legitimate senders advertise themselves incorrectly as a non-internet routable IP when attempting to open a connection to

You can find the current list of our MTAs by querying "nslookup –q=mx hotmail.com" from a command prompt (this should work in a variety of Operating Systems).

Currently, the addresses for these servers are mx1.hotmail.com, mx2.hotmail.com, mx3.and mx4.

Smart Screen® email filters are influenced by a number of factors related to the sending IP, domain, authentication, list accuracy, complaint rates, content and more.

Of these, one of the principal factors in driving down a sender's reputation and deliverability is their junk email complaint rate.

Once the IP has built a reputation for not sending spam, will typically allow for a better email delivery experience.

New IPs that are added for domains that are authenticated under existing SPF records typically experience the added benefit of inheriting some of the domain's sending reputation.

If that doesn't work, try connecting directly to the IPs.

If you are able to connect directly to the IP and not mail.hotmail.com, then it is likely there is an issue with your DNS server.

Microsoft's Smart Screen® technology is designed to provide anti-spam filtering innovations for as well as other Microsoft products like Exchange Server, Microsoft Office Outlook and Windows Live Mail.